Way too early to tell. Actually I've only had one night with my Utopias since getting them. Went to the baseball game yesterday (Go Jays Go!!!) and today my son played a double header (and we won the league championship!). Just sitting down right now and gotta say the Utopia's are deserving of their initial hype. These headphones are the real deal. But I'd like to really burn them in a bit and get to know them better. They compare quite well...the LCD-4s (& SR-009s) are among the very best I've come across. Funny you should mention the GS-X Mk2...this combination is ridiculously good with both headphones.